Abstract
An estimation of population inversion for the (0 0 0 1) and (1 0 0 0) states of the CO 2 molecule in the Earth's atmosphere is presented. The evaluation shows the inversion to occur near a height of 95–100 km in daytime. The principal source of the (0 0 0 1) state pumping is the absorption of solar radiation in the 4.3 μm CO 2 band. The collisional transfer of energy from O( 1D) atoms to the (0 0 0 1) state amplifies the inversion significantly. The maximum value of ([ CO 2(0 0 0 1)]−[ CO 2(1 0 0 0)])/[ CO 2(1 0 0 0)] cannot be less than ≈0.2. However, the maximum order of the total directional gain for laser emission in the 10.4 μm CO 2 band along the tangent path was found to be small, it varies from 0.3×1 0 −5 to 1 0 −5 depending mainly on the extent to which the O( 1D) source contributes to (0 0 0 1) state pumping. The utilization of the natural inversion could be possible by forming a lasing cavity with orbiting mirrors should the engineering problem associated with the slow accumulation of electromagnetic wave energy in the cavity be solved.
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